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#pragma once
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
/* MSVC-specific headers */
#ifdef _MSC_VER
#include <intrin.h>
#include <immintrin.h>
#endif
#if defined(__wasm__) && defined(__EMSCRIPTEN_PTHREADS__) && defined(__clang__)
/*
* Clang for WebAssembly target lacks stdatomic.h header,
* even though it supports the necessary low-level intrinsics.
* Thus, we implement pthreadpool atomic functions on top of
* low-level Clang-specific interfaces for this target.
*/
typedef _Atomic(uint32_t) pthreadpool_atomic_uint32_t;
typedef _Atomic(size_t) pthreadpool_atomic_size_t;
typedef _Atomic(void*) pthreadpool_atomic_void_p;
static inline uint32_t pthreadpool_load_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address)
{
return __c11_atomic_load(address, __ATOMIC_RELAXED);
}
static inline size_t pthreadpool_load_relaxed_size_t(
pthreadpool_atomic_size_t* address)
{
return __c11_atomic_load(address, __ATOMIC_RELAXED);
}
static inline void* pthreadpool_load_relaxed_void_p(
pthreadpool_atomic_void_p* address)
{
return __c11_atomic_load(address, __ATOMIC_RELAXED);
}
static inline void pthreadpool_store_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
__c11_atomic_store(address, value, __ATOMIC_RELAXED);
}
static inline void pthreadpool_store_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
__c11_atomic_store(address, value, __ATOMIC_RELAXED);
}
static inline void pthreadpool_store_relaxed_void_p(
pthreadpool_atomic_void_p* address,
void* value)
{
__c11_atomic_store(address, value, __ATOMIC_RELAXED);
}
static inline void pthreadpool_store_release_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
__c11_atomic_store(address, value, __ATOMIC_RELEASE);
}
static inline void pthreadpool_store_release_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
__c11_atomic_store(address, value, __ATOMIC_RELEASE);
}
static inline size_t pthreadpool_fetch_sub_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t decrement)
{
return __c11_atomic_fetch_sub(address, decrement, __ATOMIC_RELAXED);
}
static inline bool pthreadpool_compare_exchange_weak_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t* expected_value,
size_t new_value)
{
return __c11_atomic_compare_exchange_weak(
address, expected_value, new_value, __ATOMIC_RELAXED, __ATOMIC_RELAXED);
}
static inline void pthreadpool_fence_acquire() {
__c11_atomic_thread_fence(__ATOMIC_ACQUIRE);
}
static inline void pthreadpool_fence_release() {
__c11_atomic_thread_fence(__ATOMIC_RELEASE);
}
#elif defined(_MSC_VER) && (defined(_M_X64) || defined(_M_AMD64))
typedef volatile uint32_t pthreadpool_atomic_uint32_t;
typedef volatile size_t pthreadpool_atomic_size_t;
typedef void *volatile pthreadpool_atomic_void_p;
static inline uint32_t pthreadpool_load_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address)
{
return *address;
}
static inline size_t pthreadpool_load_relaxed_size_t(
pthreadpool_atomic_size_t* address)
{
return *address;
}
static inline void* pthreadpool_load_relaxed_void_p(
pthreadpool_atomic_void_p* address)
{
return *address;
}
static inline void pthreadpool_store_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
*address = value;
}
static inline void pthreadpool_store_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
*address = value;
}
static inline void pthreadpool_store_relaxed_void_p(
pthreadpool_atomic_void_p* address,
void* value)
{
*address = value;
}
static inline void pthreadpool_store_release_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
/* x86-64 stores always have release semantics */
*address = value;
}
static inline void pthreadpool_store_release_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
/* x86-64 stores always have release semantics */
*address = value;
}
static inline size_t pthreadpool_fetch_sub_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t decrement)
{
return (size_t) _InterlockedExchangeAdd64((__int64 volatile*) address, (__int64) -decrement);
}
static inline bool pthreadpool_compare_exchange_weak_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t* expected_value,
size_t new_value)
{
const __int64 expected_old_value = *expected_value;
const __int64 actual_old_value = _InterlockedCompareExchange64(
(__int64 volatile*) address, (__int64) new_value, expected_old_value);
*expected_value = (size_t) actual_old_value;
return actual_old_value == expected_old_value;
}
static inline void pthreadpool_fence_acquire() {
_mm_lfence();
}
static inline void pthreadpool_fence_release() {
_mm_sfence();
}
#elif defined(_MSC_VER) && defined(_M_IX86)
typedef volatile uint32_t pthreadpool_atomic_uint32_t;
typedef volatile size_t pthreadpool_atomic_size_t;
typedef void *volatile pthreadpool_atomic_void_p;
static inline uint32_t pthreadpool_load_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address)
{
return *address;
}
static inline size_t pthreadpool_load_relaxed_size_t(
pthreadpool_atomic_size_t* address)
{
return *address;
}
static inline void* pthreadpool_load_relaxed_void_p(
pthreadpool_atomic_void_p* address)
{
return *address;
}
static inline void pthreadpool_store_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
*address = value;
}
static inline void pthreadpool_store_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
*address = value;
}
static inline void pthreadpool_store_relaxed_void_p(
pthreadpool_atomic_void_p* address,
void* value)
{
*address = value;
}
static inline void pthreadpool_store_release_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
/* x86 stores always have release semantics */
*address = value;
}
static inline void pthreadpool_store_release_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
/* x86 stores always have release semantics */
*address = value;
}
static inline size_t pthreadpool_fetch_sub_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t decrement)
{
return (size_t) _InterlockedExchangeAdd((long volatile*) address, (long) -decrement);
}
static inline bool pthreadpool_compare_exchange_weak_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t* expected_value,
size_t new_value)
{
const long expected_old_value = *expected_value;
const long actual_old_value = _InterlockedCompareExchange(
(long volatile*) address, (long) new_value, expected_old_value);
*expected_value = (size_t) actual_old_value;
return actual_old_value == expected_old_value;
}
static inline void pthreadpool_fence_acquire() {
_mm_lfence();
}
static inline void pthreadpool_fence_release() {
_mm_sfence();
}
#else
#include <stdatomic.h>
typedef _Atomic(uint32_t) pthreadpool_atomic_uint32_t;
typedef _Atomic(size_t) pthreadpool_atomic_size_t;
typedef _Atomic(void*) pthreadpool_atomic_void_p;
static inline uint32_t pthreadpool_load_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address)
{
return atomic_load_explicit(address, memory_order_relaxed);
}
static inline size_t pthreadpool_load_relaxed_size_t(
pthreadpool_atomic_size_t* address)
{
return atomic_load_explicit(address, memory_order_relaxed);
}
static inline void* pthreadpool_load_relaxed_void_p(
pthreadpool_atomic_void_p* address)
{
return atomic_load_explicit(address, memory_order_relaxed);
}
static inline void pthreadpool_store_relaxed_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
atomic_store_explicit(address, value, memory_order_relaxed);
}
static inline void pthreadpool_store_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
atomic_store_explicit(address, value, memory_order_relaxed);
}
static inline void pthreadpool_store_relaxed_void_p(
pthreadpool_atomic_void_p* address,
void* value)
{
atomic_store_explicit(address, value, memory_order_relaxed);
}
static inline void pthreadpool_store_release_uint32_t(
pthreadpool_atomic_uint32_t* address,
uint32_t value)
{
atomic_store_explicit(address, value, memory_order_release);
}
static inline void pthreadpool_store_release_size_t(
pthreadpool_atomic_size_t* address,
size_t value)
{
atomic_store_explicit(address, value, memory_order_release);
}
static inline size_t pthreadpool_fetch_sub_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t decrement)
{
return atomic_fetch_sub_explicit(address, decrement, memory_order_relaxed);
}
static inline bool pthreadpool_compare_exchange_weak_relaxed_size_t(
pthreadpool_atomic_size_t* address,
size_t* expected_value,
size_t new_value)
{
return atomic_compare_exchange_weak_explicit(
address, expected_value, new_value, memory_order_relaxed, memory_order_relaxed);
}
static inline void pthreadpool_fence_acquire() {
atomic_thread_fence(memory_order_acquire);
}
static inline void pthreadpool_fence_release() {
atomic_thread_fence(memory_order_release);
}
#endif
static inline bool pthreadpool_try_decrement_relaxed_size_t(
pthreadpool_atomic_size_t* value)
{
#if defined(__clang__) && (defined(__arm__) || defined(__aarch64__))
size_t actual_value;
do {
actual_value = __builtin_arm_ldrex((const volatile size_t*) value);
if (actual_value == 0) {
__builtin_arm_clrex();
return false;
}
} while (__builtin_arm_strex(actual_value - 1, (volatile size_t*) value) != 0);
return true;
#else
size_t actual_value = pthreadpool_load_relaxed_size_t(value);
if (actual_value == 0) {
return false;
}
while (!pthreadpool_compare_exchange_weak_relaxed_size_t(value, &actual_value, actual_value - 1)) {
if (actual_value == 0) {
return false;
}
}
return true;
#endif
}
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